contaminated runway

contaminated runway
A runway that has standing water, ice, snow, frost, heavy rubber, or other substances present on its surface. A runway is contaminated with respect to rubber deposits or other friction-degrading substances when the average friction value for any 500-ft segment within the available landing distance (ALD) falls below the recommended minimum friction level and the average friction value in the adjacent 500-ft segments falls below the maintenance planning friction level. It also means more than 25% of the runway surface area within the required length and width is covered by surface water, slush, or loose snow more than 3 mm in depth, or there is ice on any part of the runway surface area.

Aviation dictionary. 2014.

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